Spark plug



Aug. 21, 1923.

S. F.. LEAGER ET Al.

S PARK PLUG Filed Sept. 2, 1921 gwben kwin' 50 is han rigidly inFatented Ang. 21, 1912.3.

KFFI- SAMUM F. LEAGER AND FRANK jH. VLIE'I, 0F SPBOTSWOOD, Nliil JERSEY.

eraan rLnG.

Application Med September, 1921. Serial No.- 497,821. A

'To all whom z't may concern:

Be it known that we, SAMUEL F. LEAGER and FRANK H. Vmn'r, citizens ofthe United States, residing at 'Spotswood, in the county of Middlesex,State of New Jersey, have invented a new and useful Spark Plug; and wedo hereby declare the following to be a full, clear, and-exactdescription of the' invention, such as will-enable others skilled in theart to which it appertains to make and use the same.

The invention relates to spark has for its object to provide a device ofthis character, wherein the insulating core of the spark plug isprovided with a plurality of spaced rings adjacent its lower end, andadjacent the lower end of the spark plug shell, thereb formin inconnection with a plate carried, by the owerend of the electrode amultiple of spark gaps extending entirely around the lower end.` of thecore, thereby insuring sparking entirely around the core and at the sametime forming spark gaps whereby the spark will be intensiiied.

vthe invention resides in the combination and arrangement of parts ashereinafter set forth shown in the drawings, described and claimed, itbeing understood that changes in the precise embodiment of the inventionmay be made within the scope of what is claimed without departing fromthe spirit of the invention.

In the'drawings: 1Figure 1 is a side elevation of the spark p ug. V

Fi re 2 is a. vertical sectional view through the lspark plug.

Figure 3 is a perspective view of one of the 40 rings carried by thelower end of the insulatin core.

' Re erring to the drawings, the numeral 1 designates a metallic shell,the lower'` end of which is provided with threads 2 'adapted to bescrewed into a cylinder head.

Threadsv 2 are carried by a hollow c lindrical extension 3 which extendsinto t e combustion chamber of the engine. Disposed in the shell 1 is aninsulating core 4, which 'core place in the shell 1 by means of a lock.nut 5 of the usual construetion. The core 4 whichv is formed from inplugs and With the above and other objects in view.

-sulating material is provided with a downl wardly extending cylindricalextension 6 axially dis osed within the cylindrical extension 3 oi theshell. Extension 6 extends to a point below the low'er end of thecylindrical extension 3' and is provided with a plurality of spacedannular grooves 7 in which grooves are disposed split spaced rings 8.Rings 8 are formed from conductor material and the upper ring is locatedadjacent the lower end of'the cylindrical exten'- sion 3 thereby formingan annular spark gap,

which the current jumps and from the upper ring 7 said current .passesto the lower ung 8 and thence to the metallic cap plate 9 earried by thevelectrode l0 `which extends through the insulatingmember 4. As thecurrent jumps the various gaps from theV lower end of the cylindricalportion 3 of the shell 1, from ring 8 to the adjacent ring and from thelower lring to the cap 9, it will be seen that the spark will beintensified, and

that sparkin will take place entirely around the lower en of thecylindrical extension 6, thereby insuring uniform sparking, also anintensified sparking, and at the samel time uniformly ignting the chargewithin the cylinder.

From the above it will be seenothat the spark plug is provided which issimple in construction and one wherein the spark will be intensified. Itwill also be seen that by providing split rings 8, that said rings' maybe easily and quickly replaced when desired without damaging the plugthereby allowing the plug to be easily and quickly repaired.

The invention having been set forth what is claimed as new and useful isA spark plug comprising a shell, an insulator disposed in said shell andhaving its lower end spaced from the inner wall of the shell and itsextreme lower end extending beyond the lower end of the shell, anannular inwardly extending inte al iange carried by the lower end of thes ell, split rings Aformed from conductor material surround l theelectrode and previded with;l an upnames to this specification in thepresence of Wardlyl extending annular' ange, said inwardly extendingannular flange carried by the casing, split rin s and upwardly ex- 5tending flange, carrie by the conductor cap being equidistant from eachother.

In testimony whereof We have signed our -Wo subscribing Witnesses.

SAMUEL F. LEAGER;

y, FRANK H. VLIET. Witnesses FLORENCE LEAGER, FmRENCE M. VLIET.

